no joke..they pop if they get hot. My mom and I got a laugh out of this a few years back cause when I was in high school we were attacked by what we call"whomppems" you have to whomp them to get it open. Mom did a sharp turn and and the biscuits rolled out of the bag. The next day we were going down the road and hear a pop, smack and us screaming. it hit the driver side back window